"Time Past"..."But Now"...."Ages to Come". Ephesians, Chapter 2. This is what rightly dividing the Bible (2 Tim. 2:15) means, in its simplest form.
If you believe your salvation can be found in M,M,L,orJ, you are living in "Time Past", which is why the Bible seems so confusing to you, and Paul is loved/hated by the RCC. You are on the other side of the Cross. And will never have eternal security.
"But Now" is where we are today. This is God's personal word to those living NOW. The whole Bible is for our understanding, but we don't read Lev. 4:27,28 and offer animal sacrifices when we sin. We don't open the Bible to Lev. 11:7,8 and refuse to eat ham. We don't read the Book of Mark, come across Mark 16:18 and open a bottle of poison, thinking everything's ok. We don't read Luke 12:33 and Acts 2:44,45 and sell everything we own and have one common treasury (Otherwise, the Vatican would have ONE HUGE garage sale).
It's all for our understanding, the way God has managed mankind throughout history. But we search the Scriptures to find how God is managing (dispensing) His word to us today.
Find out where you are in God's word, and become an effective workman that needeth not to be ashamed, rightly dividing the word of truth. 2 Tim. 2:15.
According to whom? What authority defines the ages for you?
Dispensatrionalism is a man made 19th century construct that has even less merit than the 16th century constructs of the Reformation. It is a credible as Tarot cards.
Amen...